Centrifugal device for dehydrating a fine-granular material



Feb. 12, 1957 w. G. J. HECKMANN ETAL 2,78L130 CENTRIF'UGAL DEVICE FOR DEHYDRATING A FINE-GRANULR MATERIAL Filed June 28, 1954 2 Sheets-Sheeil 1 lip- United States Y*Patent- CENTRIFUGAL DEVICE FOR DEHYDRTING A FlNE-GRAULAR MATERIAL Wolfgang Gertrud `loseph Heckmann, Koln-Deutz, and

Joseph Hubert Becker, Koln-Mullleim, Germany, assignors to Kiockner-Humboidt-Deutz Aktiengesellschaft, Koln, Germany, a German corporation Application June 28, 1954, Serial No. 439,822 Claims priority, application Germany June 30, 1953 12 Claims. (Cl. 21S-72) The presentinvention relate'sto 'a centrifugal device, and more particularly to a centrifugal 'device or centrifuge for dehydrating a fine-granular material having a sieve drum which is imparted vibrations by a crank gearing having a connecting rod being connected with the sieve drum bya loose coupling.

It is an object of the present inventionto render the loosecoupling between the sieve drumand the connect- `ing rod movable to all sides.

It is another object of the present invention to impart avrnovabilityto all sides'to the end of the connecting rod opposite to the end connected by the loose coupling lwiththesieve drum.V

j 'It is a further object of the present invention `to` avoid any end pressures caused by swinging or oscillating movements of the sieve drum in the bearing thereof.

Other objects andadvantages of the present invention will become clear from`the` following detailed description thereof, in connection with the accompanying drawingV showing, by way of example, -an embodiment of the present invention. VIn the drawing: f

Figfl is a'sectional elevation of a centrifugal device according tothe present invention,Y

Fig(V 2Y is a sectional elevation on a larger scale of a part of Fig. l,

Fig. 3 is a sectional elevation on a larger scale of Nanother part of Fig.V l, and

VfFig. 4 shows a sectional elevation of the part of Fig. 3 turned through 90.

Referring now to the drawings, it will Ybe seenthat a 'sieve drum 1 is shaped as a frustum'of a hollow inverted circular'cone having a substantially vertical axis and which vis open at theupper'end thereof. A t the lower end of the sieve drum 1 a substantially horizontal ringshaped base member or plate 2 is arranged Vwhich is preferably olset so as to form substantially horizontal outer and inner portions 2' and 2" connected Vwith each other by a substantially vertical portion 2"', the outer portion 2 ,being arranged at Ya higher level than Vthe inner portion 2". A substantially frusto-conical ca'p`3 is attached to the upper or outer portion 2f of the base member 2 by means of theY lower marginal porti/on '3' ofa cap 3 so that the. cap 3 protects the bearings and springs. moreV fully-to be described hereinafter, against water.anddirt.,- f

A stationary memberddesigned asra hollowvertical shaftV rigidly connected to the frame ',5V ofthe machine projects Ywith itsupperV end intotheV frusta-conical cap Frice the inner olset portion 2" of the base plate 2 and abut against a ring 13 which is secured to the body 8 by means of a screw-threaded portion 8. The vibrating bodies 10, 11 form resilient means and are designed preferably as helical springs. The vibrating bodies or members 10, 11 are inserted in suitable recesses (not shown) of the base plate 2, the collar 8a, and the ring 13 in order to impart to the bodies or members 10, 11 well-defined positions relativeto the parts 2, 8a, and 13. The bodies lil, llthus serve for transferring the torque from the body 8 Vto the base plate 2 and to the sieve drum 1 rigidly connected thereto, as more fully described in the copending applications Serial No. 392,659, liled November 17, i953, now abandoned, and Serial No. 428,266, tiled May 7, 1954, for Centrifugal Device for Dehydrating a Fine-Granular Material.

The lower portion 8 of the body 3 which is' arranged below the collar 8a is designed as a pulley provided with grooves for V-belts indicated by the dash-dotted lines 43 which engage a second pulley 15 attached to the upper portion of a shaft 16 -of a driving motor 14 secured to the frame 5 of the machine. A

A substantially horizontal crank shaft 18 is supported by bearings 34, 35 arranged in the enlarged portion 4 of the stationary member 4 so as to be removable in axial direction. The crank shaft 18 is coupled by a belt pulley 19 and a belt (not shown) with a driving motor (not shown). l

The stationary member or shaft 4 is hollow and serves as a housing for a connecting rod 2i) the lower end of which is connected with the bend 18 of the crank shaft 18 in the following manner: The end portion 36 of the connecting rod A2) is designed as an independent structural part which is guided on the eccentric part 1S of the crank shaft 1S by means of a bearing 38 (Figs. 3 and 4). Furthermore, the end portion 3 6 is connected with the Vconnecting rod 20 by means of the bolt 37 so as -to form a joint. The end portion 36 of the connecting rod 20 is provided with two lateral holes 36 in which the bolt 37 fastens. Thus itV will be seen that the end portion 36 forms together with the joint bolt 37 a Cardan joint connecting the eccentric part 13 of the crank shaft 18 with the connecting rod 20. .In this manner a movability to all sides is ensured and any end pressures caused by the oscillating or swinging movements of the sieve body or drum 1 in the bearing 38 are avoided. The bearing 38 is formed Vpreferably by two roller or ball bearings (not shown).

VThe upper end portion 26 of the connecting rod 26 is gmided in a hub 23 by means of a self-aligning roller bearing 22 having barrel-shaped parts 22' and 22` V(Fig. 2). The inner part 22 of the bearing 22 is held by a disc 24 and a nut 25 on the upper end portion 2d of the connecting rod 20 whereas the outer part 22 is secured to the'hub 23 by means of a cap 26 and screws 27 connecting the cap 26 with the hub 23. The hub 23 forms a structural part of the loose coupling connecting the connecting rod 20 with the sieve drum 1 and transfers the axial Vibrations to the latter. between the connecting rod 20 and the sieve drum 1 Vis movable to all sides. In' order to accomplish this the hub 23 isprovided with a ilangeZS held between two annular rubber springs 21. The rubber springs 21 are arranged in axial-direction between rings 20 and 3G and are compressed byvscrew bolts 31 connecting the rings 29 and 30 with each other. For adjusting the initial stress ofthe rubber springs 21 the screw bolts 31 are preferably surrounded by Vtubular Vdistance pieces 39, the length of which is adapted' so as toA result in a .priedetermined pretension ofV the` rubber springs 21. The lower ring 29 is attached by means of screws 32 to an annularcollar44 attached'to the upper end of the hollow The loose coupling frusta-conical member or cap 3. Thus the connecting rod 20 is connected with the sieve drum 1 in an articulated manner allowing movements to all sides. At the same time the self-aligning roller Vbearing 22Y takesl up any longitudinal forces.

A frusto-conical cap 45 is secured to the ring 30 by means of screws 33.. rThe lower edge of the frustoconical cap 45 is supported by the angular .collar 44 so Vas to form a seal;` The rubber springs 21, the bearing 22,

' drum land'atter starting'lthe' motor l14V and the motor (not shown). driving Vthe belt' (not shown) driving the belt pulley.19 the liquid contained in the material to be dehydrated Vis Vcarried through'the perforated kwall of the Vsieve drum 1 as more fully described in the copending applications Serial No. 392,659, filed November 17, 1953, and No. 428,266, lerl May 7, 1954, both for a Centrifugal Device for Dehydrating a Fine-Granular Material. The liquid` is caught by the annular container 46 from which it is withdrawn through the conduit 47. The dry material travels over the upper rim portion 48 of the sieve drumV 1 and entersrthe annular space 49 between the wallV of the container 50 and an outer casing S'Itfrom which it falls downwards into a Ycollecting bin 52. g The outer casing 51 is secured to the outer rim portion of the frame'S which is stiffened in this range by ribs 53.

to .the frame 5 oi.4 the machine. y Theframe 5 is supported on the foundation 12 by means ofV soft springs 9 which consist preferably of rubber. YThus the centrifugal Vdevice consists of tvvoV ing the invention.

The casings 51 and 54 arerigidly secured VWhat we claim is: v Y

l. A centrifugal device comprising a sieve drum mounted for rotation about its axis and simultaneous vibration along its axis, means for rotating said sieve drum, and means for vibrating said sieve drum including a crank shaft, a connecting rod, a universal joint connecting said crank shaft to said connecting rod, said connecting rod extending generally intheV direction of fthe axis of said sieve drum, and means yeldable in the direction of said axisl including a lresilient member securing said connecting rod to said sieverdrum, said yieldable means permitting yieldingly limited axial and universal rnove- Y ment of said sieve drum with respect to.said'connecting rod. Y l

' 2. In acentrifugalsdevice as claimed in `claim l, said resilientmember forming the sole connection between said connecting rod and said sieve drum.Y

3. In a centrifugal device as claimed in claim 1, said ange, andV clamping means engaged withsad resilient elements forurging same against said sides of the ange, Y

said clamping Vmeans being connected with said sieve drum. f Y

4. Inra centrifugal device as claimed in claim 3, an

antifrictionbearing interposed Vbetween `said connecting rod and said hub for rotatably/'carrying the latterV on the Y former. Y

mass systems in Vwhich'th'e sieve drum forms the first mass and the Yframe inclusive the "driving mechanism or device and the casings 51 and 54 the second or .counter-mass as more'fully disclosed in', the copendirig patent applications mentioned hereinabove. V.During operation the sievedrum oscillates or vibrates as first mass inthe opposite direction tothe counter-mass so thatl a very/'favorable balancing of the masses is obtained. The

Y proportion of the tirrstrmass to thecounter-mass amounts fpreferably toV 1:8 to l:l5so that the amplitude of the vibrationsV carried out by the frame and the parts rigidly connected therewith isrvery small. These smallV vibrations have a favorable'effect on the carrying away of the Y,frequency of they sieve drum 1 i. e. the frequency of the Y vertical vibrating movements of the sieve drum 1 supported by the vibrating bodies 16, 11 Vis in resonancewith Vthe frequencyV of the vibrator formed by the crank shaft 1S, the connecting rod Z0 and the loose coupling connect- Y ing the connecting rod with the sieve drum.

The elasticity ofV the rubber springs 21 is chosen pref-Y ferablyV such thztttheseV springs yield great'forces.V

` this manner diminishing ofthe amplitudes of the sieve .Y

' KYdrum diminish under therdampingfiniluence on the lo'ad of '.thesievevdrum'isravoided.' l,

A special'advantageof the centrifugal device. according to* the inventon'is the compact structurethereof wnichis'closed on all sides. 5 Y

The invention is particularly suitable for a `centrifugal made in the formgconstruction, and arrangement ofthe f Y several parts of the illustratedY Ycentrifugralf-device with-r out departing from the 'spiriti'andfscope of our invention said connectingrod.v f l -SQIrraY centrifugal device as claimed inclaim 7,'said' Y resilient'member formingrthe; soleconnection between saidconnecting rod and said sieve drm-n.2 Y i 9v. YIn a'centrifugal device as'claimed in'clairn "I, said yieldable means Vincluding a hubrrotatably mounted onY said'con'necting rod'for rotationraround the longitudinal'V 5. In a centrifugal device as claimed in claim v3, said f Vresilientelements being in the shape of a pair'of annular rubberspringgV one arranged on each side of said flange.

. 6V. In a. centrifugal device as claimed in claim l, Vsaid universal joint including a body having a bore, said crank shaft passing' through said bore, andl said body being in` pivotal connection with saidY connecting rod, the axis of said pivotal connection being perpendicular to the axis Vof said bore. Y

7.V A centrifugal device comprising a sieve drum mounted for rotation about its axis and simultaneous vibration along its axis, actuating means mounted for rotation about its axis, resilient Ymeans arranged between Y and operative@ connected with said actuating means and saidV sieve drum, said resilient means being capablev of transrrutting a rotation of said actuating means toV said Ysieve drumV and being capable of yielding in the direction Yof the longitudinal axis of said sieve drum, `so as topermit vibrating movementfof said Vactuating means and Vsaid YSievejclrurn relative to Leach other, an actuator operatively f 'connected with said actuating means for rotatingV same and. said sieve drum, yand means for vibrating said sieve drum including a crank shaft, a connecting rod, a univer- 'sal joint'connectingsaidcrank sha-ft to sai-di connecting rod, Vsaid.connecting rod'extending generallyin the .direction ofthe axis of said-sieve drum, and means VyieldableV in thedir'ectionof said Vaxisincluding a resilient member universalmovement of said sieve drunrwith respect to angefand clamping means engaged withY said resilient elements for urging same'against said sides of the'a'nge,

said clamping means being connected with said sieve drum 10. In a centrifugal device as claimed in claim 9, an antfriction bearing interposed between said connecting rod and said hub for rotatably carrying the latter on the former.

11. In a centrifugal device as claimed in claim 9, said resilient elements being in the shape of a pair of annular rubber springs, one arranged on each side of said auge.

12. In a centrifugal device as claimed in claim 7, said universal joint including a body having a bore, said crank shaft passing through said bore, and said body being in pivotal connection with said connecting rod, the axis of said pivotal connection being perpendicular to the axis of said bore.

References Cited in the tile of this patent UNITED STATES PATENTS 1,438,149 Voss Dee. 5, 1922 2,254,455 Sorenson Sept. 2, 1941 2,275,846 Dunham Mar. 10, 1942 10 2,519,813 Bayless Aug. 22, 195o 

